Indirect water heater



Feb. 10, 1931. c. H. MORROW 1,791,531

' INDIRECT WATER HEATER Filed June 6, 1928 2f If:

INVENTOR Kym WWW ATTORNEYS Patented Feb. 10, 1931 burrs!) STATES PATENT oFFicE CLARENCE H. MORROW, OF CLEVELAND, OHIO, ASSIGNOR TO THE HOTSTREAM HEATER COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO INDIRECT WATER HEATER Application filed June 6, 1928. Serial No. 283,434.

This invention relates to heating apparatus and particularly to indirect heaters applied to a domestic hot water reservoir or boiler and the water or steam space of a furnace whereby the heat of the furnace is transferred to the domestic hot water reservoir or boiler.

In the use of indirect heaters it has been found that the jacket or casing, supplying that water from the heat circulating medium, such as a furnace, becomes foul with sediment and sludge from the boiler and not only impedes the circulation of the water therein, but also collects upon the coil of the secondary water circuit and prevents the proper transfer of heat to this circuit. It is desirable, therefore, to arrange these indirect heating casings so that access may be had thereto for flushing purposes, the flushing not to be con ducted by draining the water from the primary or heating circuit, but from an extraneous water source such as a hose or the like connected to the house water supply. The means for effecting such flushing or washing should be arranged so that a stream of water could be played upon the coil in the casing to the extent of dislodging any sediment or foreign matter collecting thereon as well as in the casing.

With the foregoing in mind, the present invention relates to a domestic boiler heating means of the indirect type wherein a casing is provided and is connected in circulatory communication with a furnace or the like, preferably the water space thereof, so that the heating medium from a furnace may circulate through the indirect heating casing and thereby heat the secondary circuit which is usually a coil connect-ed to the domestic reservoir or boiler.

The invention also contemplates the use of suitable openings, provided with removable plugs, preferably'near the top and bottom of the casing, to permit of flushing the same, circulation of the primary circuit of the fur nace or the like being cut off during such process by suitable valves arranged in the supply and return of the primary circuit between the furnace and casing.

The foregoing and other features of the indirect heater return 3 provided with a suitable shut ofi valve 4. Leading from a high point in the water space is an indirect heater supply 5 also provided with a valve 6. Connected to these two valves are suitable pipes 7 and 8 leading to the bottom and top of the indirect heater casing.

The indirect heater casing comprises two hollow cylindrical cup-shaped members 9 each provided with an end flange 10 and diametric opposed openings 11 on the cylindrical side near the closed end of the cup. The closed end 12 of the cup is provided with a centrally disposed opening 13 for the reception of a threaded shank 14 of a coil connection 15 in the form of an l. with a reduced opening 16 for connection to the coil 17. This connection 15 is provided with a rectangular flange 18 adapted to have its corners nest within angle-shaped lugs 19 properly arranged upon the inner face of the wall 12 to prevent rotation of this connection. The threaded shank 14 is provided with a nut 20 for drawing the connection tightly against the gasket 21 to prevent leakage at this point. The threaded shank 14: also receives a union structure indicated at 22 and connecting the circulating pipes 23 and 24 to the secondary coil or circuit of the indirect heater. As stated, the casing is made up of two of these cup-shaped parts 9 and their flanges 10 are secured together to form a suitable casing by suitable bolts indicated at 10a.

Upper and lower openings 11 are connected to the pipes 7 and 8 to permit the circulation of the primary heating. medium from the boiler through the casing while the opposite openings 11 are closed by suitable removable p ugs 25. These plugs may be removed at any time for the purpose of flushing, the casing and washing the coil 17. The pipes 23 and 24 lead to the top and bottom of a hot domestic reservoir or boiler 26.

From the foregoing, it will be seen that when the indirect heater is connected in circuit with the, furnace and the hot water reservoir or boiler and the water in the furnace becomes heated, it will circulate through the indirect casing if the Valves i and 6 are i open and the heat from this primary circuit will be transferred to the water in the coil 17 therebyheating the water in the domestic reservoir or boiler. As the indirect heater becomes foul by the collection of sediment in the casing and upon the coil, the operator may close the valves 4 and 6 and flush the indirect heater by removal of the plugs 25 without the loss of any considerable Water in the primary circuit connected with the furnace What I claim is: An indirect water heating unit comprising a cylindrical casing, secondary circuit connections in the heads of said casing, and diametrically opposed primary connections adjacent each end of said cylindricalbasing, both sets being in the same longitudinal plane. y

In testimony whereof I hereby afiix my signature.

CLARENCE H. MORROW. 

